広島 ひろしま がた原爆 げんばくだったら
hiroshimagata gembakudattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 広島型原爆

1. If it were a Hiroshima-type atomic bomb.; If it had been a Hiroshima-type atomic bomb.

Tara Conditional